Process of preparing stable solutions of di-methylamino-tetramino-arsenobenzene.



nnrran snares earner carton LORENZ ACE, OF MANNHEIM, ALBERT ROTHMAN N, OF HEIDELIBERG, AND GUSTAV GIEMSA, OF HAMBURG, GERMANY, ASSIGNORS T0 FABIBWEBKE VOBIII. MEISTER LUCI'US & BRUENING, 0F HijCHST-ON-THE-MAIN, GERMANY, A FIB/M.

PROCESS OF PREPARING STABLE SOLUTIONS OF DI-METHYLAHINO-TETBAMINO- Patented May 14, 1918.,

ARSENOBENZENE.

1 255,364 Specification of Letters Patent.

Ho Drawing.

To all whom it may concern:

Be it known that we, LORENZ A011, ALBERT Rornnmivn, and Gus'rAv GIEMSA, citizens of the German Empire, residing at Mannheim, Heidelberg, and Hamburg, Germany, respectively, have invented certain new and useful Improvements in Processes of Preparing Stable Solutions of Di-Methylamino- Tetramino-Arsenobenzene; and they do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention has for its object to render di methylamino -otetramino arsenobenzene available for special therapeutic uses and it consists in preparing solutions of this body, thesesolutions being stable and permanent in the absence of oxygen.

We have made the surprising discovery that said body, di-methylamino-tetramino-arsenobenzene, whose constitutional formula is and whose properties and method of manufacture have been described in Letters Patent of the United States, No. 1,081,079, dated December 9, 1913, dissolves in aqueous solutions of bicarbonates, salts of carbamic acid being probably formed concurrently with such solution. Such a solution is obtained if the said compound is dissolved in a solution of molecularly equivalent quantity of a bicarbonate, for example, sodium bicarbonate or ammonium bicarbonate.

If, instead of starting with this basic compound, we employ one of its salts, such, for example, as its hydrochlorid, the quantities of bicarbonate to be added must evidently be correspondingly increased. In this case neutral carbonates may be employed instead of the iii-carbonates,

Another modification of the above method consists in suspending the base in water and then adding to the bath so formed an alkah,

Application filed January 10, 1914!- Serial No. 811,452.

such as an aqueous solution of sodium hydrate, or of potassium hydrate, or ammonia, whereupon carbon dioxid is introduced into the bath until complete solution ensues;

The resultant solution has an approximately neutral reaction. By adding alkali or an acid thereto the free base or its salt is precipitated. By adding a suitable organic solvent, miscible with water, such as alcohol or acetone, to the solution the compound formed in said solution and which we assume to be a carbamate of sodium, potassium or other metal or radical according to the reagents employed, may be separated therefrom. These salts are yellowish brown, unstable in the air and readily soluble in water and quickly become dark when exposed to the air. They are insoluble in alcohol, acetone and ether. They decompose on heating.

The solutions obtained according to this process are of great importance for the therapeutic use of di-methylamino-tetra- EwampZc 1.

56,8 grams of chlorid of di-methylaminotetramino-arsenobenzene are dissolved in Water and mixed with 200 cubic centimeters of a double normal solution of sodium hydrate; The base which thus forms is separated by filtration and washed with water until it is free from alkali, whereupon it is suspended in about 500 cubic centimeters of water, 2'26 cubic centimeters of a 3.36 per cent. solution of sodium bicarbonate being added to the suspension. In order to bring about the solution, the whole is shaken in a bottle from which the air has been expelled by the introduction oi caches dicxicl. Such solstice occurs a sheet time. The sole tioh whee complete is filteseel in cheeses of air is stoxecl is hottl s with Gilllooh olioxicl or nitrogen,

Ewemple 2.

ac grams of chloricl of di-methylaminoteti'amisoaesehohenzene are dissolved in shoot tllcuhic centimeters of Water and the solution is then mixed with a solution of 12.3 grams of sodium hicorhonate in 200 cubic centimeters es Water. This mixture is then inttctlucerl into a hash: we the latter evacuateol. The lease which at fast sepa' methylamiso-tetsataih arsenoloehsene isalso obtained; East/2,5032 1i,

233i rates of chloi icl of tli-methylamihctetramno-arsenohenzeae are dissolved in ahout 500 cubic centimeters of Water anal the solution is then mixecl with an equeoes solution o 16:82 oi ammonium leicaohcnate or of 2G of potassium hicai'hohate, the loath losing them treateel es in Em ample 2 Ecomgoie 5,

The ease sepei'atecl from the reectioh of 2% cuhic cehtimetess of doulolei-aomei '1' t a J TL-1,; ,fl'fl, 5P 8 s a 12 soomm loyalists solution 171 a. 0. lass; oi chloriol of di-methylammo-teteammo-arsenoloenzehe, ac'cordmg to Example 1 1S suspehelecl about 508 culoic centimeters of Water anal. to this hath 5.00 coloic centimeters v of doable-normal soeliem hydrate solution are aclclecl, caeloon chozicl being? mtrodecel' into the Whole until complete solution occurs.

' to secure Letters Fate,

.. 4 v q is he mosses .4. .5 d I. b 13 USQflll tor therapeutic purposes whaccohslsts H1 sub ecting a substance comprising d1-methylammo-tetrammo-arseholoshame to the action of a soluble carbonate in the presehce ct Water. 7

a 2; The process of producing preparations useful for therapeutic purposes which consists is subjecting a suhstance comprising tli-methylamino-tetramihc-arsenohenzine to the action of a soluble bicarbonate in the presence of Water.

3. The process of producing preparations useful for therapeutic purposes which consists in suhjectihe a salt of di-methylamiootetramiho-ei'senohehaene to the action of a soluhle cashohate in the presence of Water.

l, The process of producing preparations useful lot" therapeutic purposes which cohsists is subjecting a salt of dli-methylamihotetramiiao-ai'sehohehzene to the action of a soiqilole bicarbonate in the presence of WflliQlf.

5, As a new chemical composition, a compoencl resulting from the iniwractioh off fiimethylamiho-teti'aminoarsenohenzene atoll a soluble carhonate, and probably correspond 511g in composition to a carhamate oi the metal ct? saclical Whose carbonate was employel,

(5. As a new chemical compositiohg'a SQlll. tion containing di-methylamino-tetsamihoacsezoohenzene probably in the form of a carhamate, said solution having a yellowish color which clot-liens upon exposure to air,

and "being decomposed loy treatment with hyiochloric acid with formation of di-methylaminotetracaieo-assenohenzese l'n testimooy whereof We hereunto afiax our signatures in the presence of Witnesses.

LQAENZ a RQTHMANN. GUSTAV GlEMSAB H. La Mmmmssoss, 

